Load type nickel base doped catalyst for biomass tar splitting and preparation method thereof

Abstract

The invention discloses a load type nickel base doped catalyst for biomass tar splitting and a preparation method thereof. The catalyst takes a spherical gamma-Al2O3 carrier as an inner core and takes three metal dioxides NiO, Fe2O3 and La2O3 as active components loaded on the surface of the spherical gamma-Al2O3 carrier, wherein the percentages by weight of the components are as follows: 6.0-15.0wt% of NiO, 3.0-9.0wt% of Fe2O3, 2.0-8.0wt% of La2O3 and the balance of gamma-Al2O3. The preparation method comprises the steps of: dissolving and evenly mixing nickel salt, ferric salt, lanthanum salt and urea; transferring the mixture to a container in which the gamma-Al2O3 carrier is loaded and the sealing the mixture; and carrying out heating, sedimentation, filtration, washing, drying and calcination on the mixture to obtain the catalyst product. The catalyst is high in activity, low in production cost and long in service life and has the effect of effectively preventing the carbon deposition and the high-temperature sintering in the using process.

Description

Technical field [0001] The invention belongs to the field of energy and chemical industry, and specifically relates to a catalyst for the catalytic cracking and reforming process of biomass tar and its preparation technology. Background technique [0002] The dual pressure of energy crisis and environmental pollution has forced people to find clean renewable energy. Biomass energy is a renewable energy that can be stored and transported, and its efficient conversion and clean utilization have attracted widespread attention. Biomass thermal conversion and utilization technology is considered to be the most effective way to achieve biomass energy conversion, especially converting it into gas fuel or gasification for power generation, which has the advantages of convenient transmission and use, and high energy efficiency. However, in the process of biomass thermal conversion into gas fuel or gasification power generation, the presence of tar in the product gas has not been effective...

AI Technical Summary

Problems solved by technology

However, ordinary commercial nickel-based catalysts not only have high production costs; but also are prone to carbon deposition and high-temperature sintering and rapidly deactivate in the high-temperature environment of biomass pyrolysis and gasification, which not only reduces the activity of the catalyst, but also seriously shortens the life of the catalyst.

Generally speaking, the deactivation of nickel-based catalysts is mainly caused by the following factors: first, when the tar content in the product gas of biomass pyrolysis or gasification is too high, the tar cracks on the surface of the catalyst, resulting in serious carbon on the surface; The high temperature environment in the process of material pyrolysis and gasification will lead to the sintering and phase change of the nickel-based catalyst and the volatilization of nickel, resulting in a decrease in the activity of the nickel-based catalyst and a greatly shortened life.

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